psr/container 1.1.0

Changed
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- This release modifies `Psr\Container\ContainerExceptionInterface` to extend the `Throwable` interface, ensuring that any implementation can actually be thrown as an exception type (the original intention of the specification).

- This release adds the `string` typehint to the `$id` argument of each of the `Psr\Container\ContainerInterface::get()` and `Psr\Container\ContainerInterface::has()` methods. These were previously documented in the annotations and specification, and are added to the interfaces as part of the [PSR-11 type additions errata](https://github.com/php-fig/fig-standards/pull/1215).

Removed
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- This release removes support for PHP versions prior to 7.2.0.